Corey–Pauling rules

In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link.

Version

v1 · 2026-09-28 · History

Domain-specific #

8730

Domain group

Natural Sciences

Origin domain

Chemistry & Materials Science

Subdomains

Structural Chemistry, Protein Structure → Chemistry & Materials Science

Core Idea

Corey–Pauling rules is treated here as the recurring natural sciences, engineering, and health identity summarized by this source-grounded definition: In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link. In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link. They were originally proposed by Robert Corey and Linus Pauling. The atoms in a peptide link all lie on the same plane.

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Three Rules for Protein Links

Proteins in your body are long chains made of links. Two scientists found three simple rules for those links: each link lies flat, the little grabbing connections between parts of the chain point in a straight line, and every grabbing spot gets used. These rules help explain the shapes proteins fold into.

Three Rules for Protein Links

Proteins are long chains of building blocks joined by links called peptide links, and they fold into regular shapes. Robert Corey and Linus Pauling came up with three rules about these links. First, all the atoms in a peptide link lie flat on the same plane. Second, when the chain is held in shape by a hydrogen bond, the nitrogen, hydrogen, and oxygen atoms line up almost in a straight line. Third, the carbon-oxygen and nitrogen-hydrogen parts of the chain all take part in that bonding.

Peptide-Link Geometry Rules

The Corey–Pauling rules, proposed by Robert Corey and Linus Pauling, are three statements about the peptide link (the CO-NH bond between amino acids) that govern protein secondary structure, the local shapes a protein chain forms. Rule one: the atoms of the peptide link all lie in the same plane. Rule two: in a hydrogen bond between chain segments, the nitrogen, hydrogen, and oxygen atoms lie approximately in a straight line. Rule three: the carbon-oxygen and nitrogen-hydrogen groups are all involved in hydrogen bonding. Together these constraints narrow down which regular shapes a protein backbone can take.

 

The Corey–Pauling rules, proposed by Robert Corey and Linus Pauling, are three basic constraints governing protein secondary structure through the CO–NH peptide link. First, the atoms of the peptide group are coplanar, so the link acts as a rigid planar unit. Second, in backbone hydrogen bonds the donor nitrogen, its hydrogen, and the acceptor oxygen are approximately collinear. Third, all backbone carbonyl and N–H groups participate in hydrogen bonding. Applied together, these rules restrict the admissible backbone geometries and hydrogen-bonding patterns, which is why they underpin the analysis of regular secondary structures.

Scope of Application

• Documented setting. In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link.

• Documented setting. The atoms in a peptide link all lie on the same plane.

• Documented setting. The nitrogen, hydrogen, and oxygen atoms in a hydrogen bond are approximately in a straight line.

• Documented setting. They were originally proposed by Robert Corey and Linus Pauling.

• Documented setting. The carbon-oxygen and nitrogen-hydrogen groups are all involved in bonding.

Clarity

A clear use of Corey–Pauling rules names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link.

Manages Complexity

Corey–Pauling rules compresses multiple natural sciences, engineering, and health details into a stable diagnostic relation. The source shows both the central mechanism—in biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link.—and the practical consequence—they were originally proposed by Robert Corey and Linus Pauling.

Abstract Reasoning

1. Type the carrier. Identify the natural sciences, engineering, and health entities to which the claim applies.
2. State the relation. Use the source-grounded identity: In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link.
3. Check operation and conditions. The atoms in a peptide link all lie on the same plane.
4. Demand recognition evidence. The nitrogen, hydrogen, and oxygen atoms in a hydrogen bond are approximately in a straight line.

Knowledge Transfer

Within the home domain. Knowledge about Corey–Pauling rules transfers literally when a new case preserves the same carrier type, relation, and recognition test. In biochemistry, the Corey–Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link. The atoms in a peptide link all lie on the same plane. Beyond the home domain. No canonical parent is asserted for Corey–Pauling rules.

Relationships to Other Abstractions

Current abstraction Corey–Pauling rules Domain-specific

Parents (1) — more general patterns this builds on

• Corey–Pauling rules is a kind of, typical Hydrogen Bond Domain-specific

  The Corey-Pauling rules constrain protein secondary structure through the geometry of the peptide N-H...O=C hydrogen bond.

Hierarchy path (1) — routes to 1 parentless root

• Corey–Pauling rules → Hydrogen Bond → Coupling

Neighborhood in Abstraction Space

Corey–Pauling rules sits in a moderately populated region (60^th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.

Family — Chemical Structure & Reactivity Concepts (22 abstractions)

Nearest neighbors

• Nucleic-Acid Secondary Structure — 0.86
• Conjugated System — 0.85
• Transition-State Analog — 0.85
• RG/RGG motif — 0.85
• Membrane Curvature — 0.85

Computed from structural-signature embeddings · 2026-10-08